Graphisoft is no doubt working with the beta release of Mavericks, too, but I doubt (?) that they can discuss anything in public. This seems like the kind of issue it would be hard for them to miss - but consider reporting it and any other beta Mavericks issues you find directly to GS via the tech support contact for your country.
In the past, there have been issues in the new OS itself (OS X and Windows) that were beyond anything GS could do... and required them to wait for fixes from Apple or Microsoft. Just as a heads up to anyone who is ready to jump onto 10.9 the moment Apple releases it: don't do it. Wait until GS announces full support.
Cheers,
Karl
One of the forum moderators
AC 27 USA and earlier • macOS Ventura 13.6.9, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB